Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (12): 20230357.doi: 10.7503/cjcu20230357

• Physical Chemistry • Previous Articles     Next Articles

Photocatalytic Water Splitting Performance of p-n-Type NiWO4/ZnIn2S4 Heterojunctions

YAN Aihua1,2, GAO Ye2, ZHANG Xiaohui2, HUANG Fei2,3(), ZHANG Tongyang2, ZHANG Jixu2, ZHAO Wenxue2   

  1. 1.School of Low?carbon Energy and Power Engineering
    2.School of Materials and Physics,China University of Mining and Technology,Xuzhou 221116,China
    3.Carbon Neutrality Institute,China University of Mining and Technology,Xuzhou 221008,China
  • Received:2023-08-07 Online:2023-12-10 Published:2023-10-10
  • Contact: HUANG Fei E-mail:huangfei7804@163.com
  • Supported by:
    the National Natural Science Foundation of China(52002399);the Xuzhou Science and Technique Program, China(KC21025)

Abstract:

In this paper, p-n-type NiWO4(NWO)/ZnIn2S4(ZIS) heterojunctions were constructed by a two-step hydrothermal/water bath method. The influence of different loading amounts for NWO on the composition, morphology, band structure, light absorption and photocatalytic water splitting performance was investigated. The photocatalytic mechanism of NWO/ZIS system was also discussed by a series of advanced characterization tools. The results show that the composition and morphology of ZIS don’t change significantly after loading NWO. Furthermore, the interface between the two materials contacts intimately and the two materials distribute uniformly. Consequently, the hydrogen evolution performance of NWO/ZIS has been markedly improved under the visible-light irradiation. Therein, the highest hydrogen production rate for NWO-35/ZIS samples is 5204.8 μmol·g-1·h-1, which is approximately 3.32 times higher than that of pure ZIS(1566.4 μmol·g-1·h-1). The cyclic experiment shows that NWO/ZIS system has excellent photostability. The band calculation and photoelectric dynamic results confirm the photogenerated charge transport mechanism driven by p-n-type internal electric field.

Key words: ZnIn2S4, NiWO4, p-n-Type heterojunction, Internal electric field, Photocatalytic water splitting into hydrogen production

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